JP5838751B2 - RECORDING MEDIUM CONVEYING DEVICE AND RECORDING DEVICE - Google Patents

Description

  The present invention is configured to control a plurality of motors serving as driving sources so that a roll body (so-called “roll paper”) around which a belt-like recording medium is wound is conveyed under a predetermined tension. The present invention relates to a recording medium transport apparatus and a recording apparatus including the same.

  As this type of prior art, there is an apparatus described in Patent Document 1. This document describes a roll motor that is a power source for rotating the roll body to supply the recording medium from a roll body around which a belt-like recording medium is wound, and a position of the roll body in the supply direction of the recording medium. A PF motor serving as a power source for driving a conveyance driving roller located on the downstream side to convey the recording medium, and the roll motor so that the conveyed recording medium is conveyed under a predetermined tension. And a motor control unit that controls the driving state of the PF motor is described.

  Since the roll body is heavy, the load when pulling out the recording medium from the roll body is large. If the recording medium is pulled out and conveyed only by the driving force of the PF motor, the recording medium may be broken. Therefore, the roll motor for rotationally driving the roll body is provided, and both the PF motor and the roll motor are driven to pull out the recording medium. Thereby, the possibility of the breakage can be reduced.

  Furthermore, when the roll body is used and the recording medium is fed out, the diameter of the roll body gradually decreases. As a result, the load of the roll motor varies. In response to this variation, a measurement is performed to measure the relationship between the load (load acting on the roll motor) when the roll motor supplies the recording medium while the PF motor is stopped and the drive speed of the roll motor. The measurement value obtained by the measurement is used to control the driving of the roll motor so as to reduce the influence of the load fluctuation.

  Furthermore, in order to increase the recording medium feed amount by the PF motor, the recording medium transported by both driving of the roll motor and the PF motor is transported in a state where a predetermined tension is applied. The drive state of the roll motor and PF motor is controlled.

JP 2009-242048 A

  However, no consideration is given to a new problem caused by the fact that the roll body to be used is gradually increased in size (for example, having a length of about 160 cm and a weight of about 80 kg). The following is said as a new problem. The roll body is set in a state in which both ends are rotatably supported on the paper feed unit of the recording apparatus. However, if the roll body is left in the set state, it is a heavy and long roll body that has appeared due to an increase in size as described above. There is a problem in that the central portion in the longitudinal direction is bent and deformed by several millimeters. When this bending deformation occurs, the center of gravity of the roll body deviates from the axial center line, so that the rotational load when the roll body makes one revolution changes greatly.

In the prior art (before the above-described enlargement of the roll body has started), the problem of the bending deformation has not been manifested. Therefore, as shown in FIG. Normally, rotation was not performed (360 degrees), but was normally performed at 1/4 rotation (90 degrees within the range indicated by reference numeral 26). In the figure, the horizontal axis represents the amount of rotation (angle) of the roll body, and the vertical axis represents the motor load obtained as a result of the execution of the measurement when the motor is driven to rotate at a certain speed (duty ratio for PWM-controlled motors). Or current value). In the figure, reference numeral 24 denotes a load variation curve of the motor when the roll body is rotated once. Reference numeral 25 denotes an average value of the load fluctuation curve 24.
As described above, since the fluctuation range of the load fluctuation curve 24 is small, the measurement can be accurately performed without any problem by executing the measurement of 1/4 rotation.

However, when the problem of the bending deformation becomes obvious due to the increase in the size of the roll body, as shown in FIG. 7B, the fluctuation range of the load fluctuation curve 27 of the motor becomes large, and the 1/4 rotation measurement. Then, it deviates greatly from the average value 28 which is the originally obtained value.
Therefore, it is necessary to execute the measurement by rotating the roll body once.

However, if the measurement is executed by simply rotating the roll body once, the roll diameter is increased due to the increase in size, so that when the rotation is extended, the length becomes considerable. For example, in a roll body having a diameter of 30 cm, the recording medium is fed out by about 1 m. Since the PF motor is stopped when the measurement is executed, the 1 m of the fed out recording medium cannot be moved downstream, and droops greatly around the roll body.
If the user sees the above state before starting printing, it is easy to misunderstand that a trouble has occurred in the recording apparatus, and there is a risk that the drooping part will contact surrounding members and damage the recording surface.

  The object of the present invention is to reduce the risk of damage to the recording surface while suppressing a large sag when performing a measurement by rotating the roll body once, and even when it is not necessary to rotate the roll body once. The goal is to be able to deal with it without waste.

In order to solve the above problems, a recording medium transport apparatus according to a first aspect of the present invention includes a first drive unit that rotates a roll body around which a recording medium is wound, and a roll body in the transport direction of the recording medium. And a transport unit that transports the recording medium, a second drive unit that drives the transport unit, and a control unit that controls driving of the first drive unit and the second drive unit. The control unit drives the first driving unit in a state where the second driving unit is stopped, and measures the relationship between a load and a driving speed when the recording medium is transported. A first measurement mode for executing the rotation for one rotation of the roll body and dividing the rotation into a plurality of rotations, and a second measurement for executing the measurement in a range in which the roll body is not rotated once. men Includes a mode, the.
In the first aspect, with a little limitation, the first motor serving as a power source for rotating the roll body to supply the recording medium from the roll body 1 around which the belt-shaped recording medium is wound, and the supply of the recording medium A second motor serving as a power source for driving a conveyance drive roller positioned downstream of the position of the roll body in the direction to convey the recording medium, and the recording medium to be conveyed is given a predetermined tension. A motor control unit that controls a driving state of the first motor and the second motor so that the recording medium is conveyed in a state, and the motor control unit receives the recording medium when the first motor is stopped. As a measurement for measuring a relationship between a load and a driving speed at the time of supply, the measurement is executed for one rotation of the roll body, and the rotation is divided into a plurality of times and executed. A jar placement mode, a second Measurement mode for executing a range not rotated once the roll body may be characterized in that it comprises a.
Here, the “roll body” is a so-called roll paper having a recording medium as a recording medium, and a material that is easily deformed due to a material such as a sheet that is not squeezed, easily stretched, or soft, such as a vinyl sheet. included.

According to this aspect, the motor control unit performs the measurement to measure the relationship between the load and the driving speed when the first motor supplies the recording medium while the second motor is stopped. A first measurement mode is provided in which the rotation is executed for one body rotation and the rotation is divided into a plurality of portions. Accordingly, since the length of one divided feeding is shortened, a large sag does not occur around the roll body, and the user cannot be noticeable.
The first motor stops after one measurement. By driving the second motor that has been stopped in the stopped state, the fed-out portion is sent to the downstream side of the second motor and disappears from around the roll body. It is possible to secure a receiving space for feeding by execution. And since the amount of the first feeding and the second feeding are not accumulated around the roll body, it is difficult for the user to stand out.

Furthermore, according to this aspect, since the second measurement mode is executed in a range in which the roll body is not rotated once, the second measurement mode can be performed when the measurement can be performed accurately without rotating the roll body once. The measurement time can be shortened by executing the measurement mode.
As described above, according to this aspect, when the measurement is performed by rotating the roll body once, the risk of damage to the recording surface can be reduced while suppressing large sagging. Even when it is not necessary to make one rotation, it can be dealt with without waste.

  In the recording medium transport apparatus according to the second aspect of the present invention, in the first aspect, the control unit performs the first measurement after the roll body is replaced in the first measurement mode. It is characterized by this.

When the roll body is exchanged, the recording medium conveying apparatus and the recording apparatus including the same usually do not have the information on the bending deformation of the new roll body.
According to this aspect, since the first measurement after the roll body is replaced is configured to be performed in the first measurement mode, it is possible to implement an appropriate measurement.

  In the recording medium transport apparatus according to the third aspect of the present invention, in the first aspect or the second aspect, the control unit has a fluctuation range of the load obtained by executing the first measurement mode. When it is below the set value, the next measurement is performed in the second measurement mode.

  According to this aspect, when the fluctuation range of the load obtained by executing the first measurement mode is equal to or less than the set value, the next measurement is performed in the second measurement mode. Therefore, the measurement can be executed by selecting an appropriate measurement mode without waste.

  In the recording medium conveyance device according to a fourth aspect of the present invention, in any one of the first aspect to the third aspect, the control unit performs the first measurement mode in one rotation of the roll body. Is divided into an even number of times, and 1/2 rotation of the roll body is performed by rotating in one direction, and the remaining 1/2 rotation is performed by rotating in the other direction.

Since the load fluctuation of the first motor in one rotation of the roll body is measured with a symmetrical relationship even if it is reversed (rotated in the other direction) for the remaining ½ rotation, the reverse rotation is possible.
According to this aspect, since the measurement is performed by reversing the remaining 1/2 rotation, the total feed amount by one rotation of the roll body can be reduced to half, and a large sag is also observed from that point. The risk of damage to the recording surface can be further effectively reduced while suppressing.

According to a fifth aspect of the present invention, in the recording medium transport device according to any one of the first to fourth aspects, the first driving unit is controlled by PWM control, and the control unit is The first measurement mode is divided into an even number of rotations of the roll body and divided into an odd number of times and an even number of times of the divided rotations, while the first driving unit is at a first speed. On the other hand, the first drive unit is driven at a second speed higher than the first speed.
That is, the speed of the first motor is controlled by PWM control, and one rotation of the roll body is divided into an even number of times, and the execution of the first measurement mode is performed at an odd number and an even number of divided rotations. In other words, the first motor is driven at a low speed, and the other motor is driven at a higher speed than the first motor.

If the speed of the first motor is controlled by PWM control, it is affected by the counter electromotive force that accompanies the rotation of the motor. However, according to this aspect, the execution of the first measurement mode is performed in divided rotations. In the odd-numbered and even-numbered times, the first motor is driven at a low speed (first speed), and the other is driven at a higher speed (second speed) than the one. Therefore, the influence of the back electromotive force can be reduced.
Here, the PWM control is a control referred to as an acronym “Pulse Width Modulation”. When PWM is translated into Japanese, it is called “pulse width modulation”. This control uses a modulation method in which modulation is performed by changing the duty ratio of the pulse wave.

A recording apparatus according to a sixth aspect of the present invention is a recording apparatus comprising: an ink ejection unit that ejects ink onto a recording medium; and a recording medium conveyance apparatus that conveys the recording medium, wherein the recording medium conveyance apparatus Is the recording medium conveying apparatus described in any one of the first to fifth aspects.
According to this aspect, the corresponding operation and effects of the first to fifth aspects can be obtained as the recording apparatus.

1 is a diagram illustrating a schematic configuration of a recording medium conveyance device according to an embodiment of the present invention. The principal part schematic side view (A) (B) (C) explaining the first half of measurement execution operation | movement of the recording-medium conveying apparatus based on the Example. The principal part schematic side view (E) (F) (G) explaining the second half of the execution operation of the measurement of the recording-medium conveying apparatus based on the Example. The principal part schematic side view (A) (B) explaining the two aspects of measurement execution operation | movement of the recording-medium conveying apparatus which concerns on the Example. The figure which shows the graph explaining the result of the measurement of the recording-medium conveying apparatus which concerns on the same Example. The figure which shows the flowchart explaining operation | movement of a recording device provided with the recording-medium conveying apparatus based on the Example. The figure explaining the conventional measurement (A) and the figure explaining the subject of this invention (B).

  First, an outline of an overall configuration of an embodiment of a recording medium conveying apparatus of the present invention and an inkjet recording apparatus which is an example of a recording apparatus including the same will be described with reference to FIG.

  The recording medium transport apparatus of this embodiment includes a first motor 2 corresponding to a first drive unit that rotates the roll body 1 around which the recording medium P is wound, and the roll body 1 in the transport direction of the recording medium P. A transport drive roller 3 positioned downstream and corresponding to a transport unit that transports the recording medium P, a second motor 4 corresponding to a second drive unit that drives the transport unit, the first drive unit, and the first drive unit And a motor control unit 5 corresponding to a control unit that controls driving with the two drive units, and the control unit drives the first drive unit in a state where the second drive unit is stopped, and the recording medium As a measurement for measuring a relationship between a load and a driving speed when transporting a roll, a first measurement mode in which the measurement is executed for one rotation of the roll body and the one rotation is divided into a plurality of rotations is executed. And the above The Yamento, and a, a second Measurement mode for executing a range of not rotating 1 the roll body.

More specifically, although partially repeated, the recording medium conveying apparatus of the present embodiment is a power for rotating the roll body 1 so as to supply the recording medium P from the roll body 1 around which the belt-like recording medium P is wound. A first motor 2 as a source and a power source as a power source for driving the conveyance drive roller 3 positioned downstream of the position of the roll body 1 in the supply direction of the recording medium P to convey the recording medium P. Two motors 4 and a motor control unit 5 for controlling the driving state of the first motor 2 and the second motor 4 so that the transported recording medium P is transported in a state where a predetermined tension T is applied. I have.
Then, the motor control unit 5 executes the measurement for measuring the relationship between the load D and the driving speed V when the first motor 2 supplies the recording medium P with the second motor 4 stopped. A first measurement mode that is executed for one rotation of the roll body and that is divided into a plurality of rotations, and a second measurement mode that is executed within a range in which the roll body is not rotated once. .

In the present embodiment, the motor control unit 5 is configured to perform the first measurement after the roll body 1 is replaced in the first measurement mode.
Further, the motor control unit 5 is configured to perform the next measurement in the second measurement mode when the fluctuation range of the load obtained by executing the first measurement mode is equal to or less than a set value. Has been.

  The first motor 2 (hereinafter also referred to as “roll body motor”) uses a rotary encoder as the rotation detector 6, and is provided with a disk-shaped scale 7 and a rotary sensor 8. The rotational power of the first motor 2 is transmitted to the roll body 1 through the gear wheel train 9. In the figure, reference numeral 14 denotes rotating holders inserted at both ends of the roll body 1.

  The second motor 4 (hereinafter also referred to as “PF motor”) also uses a rotary encoder as the rotation detection unit 10, and is provided with a disk-shaped scale 11 and a rotary sensor 12. The rotational power of the second motor 4 is transmitted to the transport drive roller 3 through the gear wheel train 13.

  In the figure, reference numeral 19 denotes a control unit, which controls all operations of the recording apparatus. The control unit 19 includes a motor control unit 5. Also, print data information is sent from the personal computer 20.

Based on FIG. 2, FIG. 3 and FIG. 4B, the measurement operation in the first measurement mode of the present embodiment will be described.
In this embodiment, one rotation of the roll body is divided into 8 times, and the measurement is executed by rotating the roll body 1 by 1/2 rotation in one direction and the remaining 1/2 rotation. It is the structure performed by reversing.
The speed of the first motor 2 is controlled by PWM control, and the execution of the measurement is performed for the first time, the third time, the fifth time, the seventh time, and the even number times of the divided rotation. The fourth, sixth, and eighth times are divided into the odd numbered times, and the first motor 2 is driven at low speed VL (L1, L2, L3, and L4 in FIG. 4), and the odd numbered times are the odd numbered times. This is a configuration in which high-speed VH driving (H2, H4, H6, and H8 in FIG. 4) is performed as compared with this.

FIG. 2 (A) shows the state immediately before the execution of the measurement in a state where the first motor 2 and the second motor 4 are stopped. That is, the conveyance drive roller 3 is stopped, and the roll body 1 is also stopped rotating.
FIG. 2B shows a state in which the first motor 2 is driven at a low speed VL by 1/8 rotation while the second motor 4 is stopped. A sag 22 is generated around the roll body 1 corresponding to the 1/8 rotation. However, since it is a one-eighth rotation, not a single rotation, the amount is small and not noticeable to the user. And by this operation | movement, the measurement of the 1st motor 2 about 1/8 rotation of the roll body 1 is performed. Specifically, the duty ratio DL1 corresponding to the low speed VL drive is obtained.
Next, FIG. 2C shows a state in which the second motor 4 is rotationally driven while the first motor 2 is stopped and the drooping 22 is sent to the downstream side.

Next, the measurement for the 1 / 8th rotation of the second time is performed by the high speed VH drive (first time) and the same operation as in FIGS. As a result, the duty ratio DH1 corresponding to the high-speed VH drive can be obtained.
Next, the measurement for the third 1/8 rotation is performed by the low speed VL drive (second time), and the duty ratio DL2 corresponding to the low speed VL drive is obtained.
Next, the fourth measurement for 1/8 rotation is performed by the high speed VH drive (second time), and the duty ratio DH2 corresponding to the high speed VH drive is obtained.

Subsequently, FIG. 3E shows a state immediately before the second half measurement in the reverse rotation direction in a state where the first motor 2 and the second motor 4 are stopped. That is, the conveyance drive roller 3 is stopped, and the roll body 1 is also stopped rotating.
FIG. 3 (F) shows a state where the first motor 2 is stopped and the second motor 4 is driven by an amount corresponding to 1/8 rotation. A sag 22 is generated around the roll body 1 corresponding to the 1/8 rotation.
Next, FIG. 3G shows a state where the first motor 2 is driven at a low speed VL (third time) while the second motor 4 is stopped, and the drooping 22 is wound up in the roll body. A duty ratio DL3 corresponding to the low speed VL drive is obtained.

Next, the measurement for the second 1/8 rotation of the reverse rotation is performed by the high speed VH drive (the third time) and the same operation as in FIGS. As a result, a duty ratio DH3 corresponding to the high-speed VH drive can be obtained.
Next, the measurement for the third 1/8 rotation of the reverse rotation is performed by the low speed VL drive (the fourth time), and the duty ratio DL4 corresponding to the low speed VL drive is obtained.
Next, the measurement for the fourth 1/8 rotation of the reverse rotation is performed by the high speed VH drive (the fourth time), and the duty ratio DH4 corresponding to the high speed VH drive is obtained.

  The measurement operation in the first measurement mode is thus completed, and the obtained four duty ratios DL1 to DL4 are averaged to obtain the duty ratio DL that is the load received by the first motor 2 in the required low speed drive. It is done. Further, by averaging the obtained four duty ratios DH1 to DH4, a duty ratio DH that is a load received by the first motor 2 in the required high-speed driving can be obtained. This is plotted in FIG. The relationship between the load D and the driving speed V of the first motor when the recording medium P is supplied with the straight line 23 in FIG. 5 stopped in the second motor 4 is obtained.

As described above, according to this embodiment, the motor control unit 5 is configured such that the relationship between the load D and the driving speed V when the first motor 2 supplies the recording medium P while the second motor 4 is stopped. As a measurement for measuring the first measurement mode, the first measurement mode is executed for one rotation of the roll body and the rotation is divided into a plurality of times, and the second measurement is executed within a range in which the roll body is not rotated once. Mode.
Therefore, according to the first measurement mode, the length of one divided feed is shortened, so that a large sag 22 cannot be formed around the roll body, and the user can be made inconspicuous.

  When one measurement is completed, the first motor 2 stops. By driving the second motor 4 that has been stopped in the stopped state, the fed-out portion 22 is sent to the downstream side of the second motor 4 and disappears from around the roll body. It is possible to secure a receiving space for feeding by the execution of the measurement. Then, since the previous feed, that is, the first feed and the second feed are not accumulated around the roll body 1, it is difficult for the user to stand out.

  Furthermore, according to the present embodiment, since the second measurement mode is executed in a range in which the roll body is not rotated once, when the measurement can be performed accurately without rotating the roll body once, By executing the two-measurement mode, the measurement time can be shortened.

  Furthermore, when the roll body 1 is exchanged, the recording medium transport apparatus and the recording apparatus including the same normally do not have information on the bending deformation of the new roll body 1. However, according to the present embodiment, since the first measurement after the roll body 1 is replaced is configured to be performed in the first measurement mode, it is possible to implement an appropriate measurement. it can.

  Furthermore, according to the present embodiment, when the fluctuation range of the load obtained by executing the first measurement mode is equal to or less than a set value, the next measurement is performed in the second measurement mode. Therefore, you can select the appropriate measurement mode without waste and execute the measurement.

  Further, according to the present embodiment, the measurement is performed by reversing the remaining ½ rotation, so that the total feed amount by one rotation of the roll body 1 can be reduced by half, and also from this point. The risk of damage to the recording surface can be further effectively reduced while suppressing large sagging.

  Further, when the speed of the first motor 2 is controlled by PWM control, it is affected by the counter electromotive force accompanying the rotation of the motor. According to this embodiment, the execution of the measurement is performed by divided rotation. Are divided into odd-numbered times (L1, L2, L3, and L4 in FIG. 4) and even-numbered times (H2, H4, H6, and H8 in FIG. 4). In this configuration, the VH drive is performed at a higher speed than the other. Therefore, the influence of the counter electromotive force can be reduced.

  In the above-described embodiment, the case where eight division measurements are performed in FIG. 4B has been described. However, according to FIG. 4A, the roll body 1 is rotated only once in one direction. You may perform split measurements.

Next, the operation of the recording apparatus including the recording medium conveying apparatus will be described based on the flowchart of FIG.
In step S1, the division measurement (in this embodiment, eight divisions) is executed as described above for one rotation of the roll body 1. As a result, a straight line 23 indicating the relationship between the load D and the driving speed V of the first motor when the recording medium P is supplied in a state where the second motor 4 shown in FIG. 5 is stopped is obtained.

  Next, in step S2, the first motor (roll body motor) 2 and the second motor (PF motor) 4 are fed so that the recording medium P to be conveyed is conveyed with a predetermined tension T applied thereto. Control the driving state. In this control, when the feed speed Vn of the recording medium P conveyed by the driving force of the second motor 4 is used, the first motor 2 is loaded with the load Dn obtained in FIG. 5 as the duty ratio for rotationally driving the first motor 2. When 2 is driven, the feed rates of the second motor 4 and the first motor 2 become the same, so the tension T is lost. Therefore, the duty ratio applied to the first motor 2 is set to be smaller than the value corresponding to the load Dn so that the feed speed of the second motor 4 is larger than the feed speed of the first motor 2. This can be executed based on actual measurement values of the rotation detector 6 included in the first motor 2 and the rotation detector 10 included in the second motor 4. As a result, the recording medium P is conveyed in a state where a predetermined tension T is applied.

  In step S3, the motors 2 and 4 are driven until recording medium feeding (paper feeding) for one pass is completed, and both motors 2 and 4 are stopped when feeding of one pass is completed. This determination is also made by the control unit 5 based on the actual measurement value of the rotation detector 10 of the second motor 4.

  Subsequently, ink is ejected by the ink ejection unit 17 to execute printing (step S5). When the paper feeding of all passes is completed (step S6), that is, when one job is completed, the printing of the job is completed (step S7).

  Subsequently, in step S8, it is determined whether there is a next job. When there is a next job, it is determined whether or not the difference between the respective measurement values obtained by executing the first measurement mode, that is, whether or not the load fluctuation range is equal to or less than a set value (step S9). ).

  When it is below the set value, the next measurement is performed in the second measurement mode (step S10). In this example, the measurement is performed by 1/4 rotation of the roll body 1. And it returns to step S2 and the above-mentioned operation | movement is performed by the measurement value obtained by the 1/4 rotation measurement of the roll body 1. FIG.

  If the load fluctuation range is not less than or equal to the set value in step S9, the process returns to step S1 and the operation is repeated.

[Other embodiments]
The recording medium conveying apparatus and the recording apparatus according to the present invention are basically configured to have the above-described configuration, but modifications or omissions of partial configurations within the scope not departing from the gist of the present invention are included. It is of course possible to do this.
For example, the control of the first motor 2 may respond to load fluctuations by voltage control instead of PWM control.

1 roll body, 2 first motor, 3 transport drive roller, 4 second motor,
5 Motor controller, 6 rotation detector, 9 gear train, 11 rotation detector,
13 gear train, 16 carriage, 17 ink ejection part,
18 Carriage guide shaft, 19 Control unit, 20 PC,
21 Conveyor driven roller, 22 hang down, 23 straight line, 24 load fluctuation curve,
25 Average value, 26 1/4 rotation range, 27 Load fluctuation curve, 28 Average value,
29 Range of one rotation

Claims (6)

A first drive unit for rotating a roll body around which a recording medium is wound;
A transport unit that is positioned downstream of the roll body in the transport direction of the recording medium and transports the recording medium;
A second drive unit for driving the transport unit;
A control unit that controls driving of the first driving unit and the second driving unit,
The control unit drives the first driving unit in a state where the second driving unit is stopped, and measures the relationship between the load and the driving speed when the recording medium is transported,
A first measurement mode in which the measurement is performed for one rotation of the roll body and the rotation is divided into a plurality of rotations;
And a second measurement mode for executing the measurement by rotating the roll body within a range in which the roll body is not rotated once . The recording medium conveying apparatus according to claim 1,
The control unit performs the first measurement after the roll body is replaced in the first measurement mode. In the recording medium conveying apparatus according to claim 1 or 2,
The control unit performs the next measurement in the second measurement mode when the fluctuation range of the load obtained by executing the first measurement mode is equal to or less than a set value. Recording medium transport device. In the recording medium conveyance device according to any one of claims 1 to 3,
The control unit performs the first measurement mode by dividing one rotation of the roll body into an even number of times, and 1/2 rotation of the roll body is rotated in one direction, and the remaining 1/2 rotation is performed. A recording medium conveying apparatus, wherein the recording medium conveying apparatus is rotated in the other direction. In the recording medium conveyance device according to any one of claims 1 to 4,
The first drive unit is controlled by PWM control,
The control unit divides the first measurement mode into an even number of one rotation of the roll body and divides the first drive unit into an odd number and an even number of rotations. The recording medium transporting apparatus, wherein the recording medium conveying apparatus is driven at a speed of 1, and the second driving is performed at a second speed higher than the first speed. A recording apparatus comprising: an ink ejection unit that ejects ink to a recording medium; and a recording medium conveyance device that conveys the recording medium,
6. The recording apparatus according to claim 1, wherein the recording medium conveying apparatus is the recording medium conveying apparatus according to any one of claims 1 to 5.

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